Yuna
never intended on abandoning her journey to get married to Seymour. She considered marrying him to make the populace happy and then trotting off and completing her journey anyway.

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THE SCRIPT
Yuna
"If my getting married would help Spira..."
"if it would make people happy..."
"If I could do that for people... maybe I should do what I can."
"I never imagined doing anything like this."
"But, I won't answer till I know what's right."
Tidus
"Seriously?"
Rikku
"You could always just quit your pilgrimage and get married."
Yuna
"I will...go on."
"I'm sure that Lord Seymour will understand."
Rikku
"Umm, I guess so..."
Yuna
"I am a summoner!"
"I must fight and defeat Sin."
Auron
"Like Braska before you."
I never understood why people disliked Yuna. I always found her devotion to self-sacrifice a good plot line to go in contrast to Tidus's self-serving plot. I always found that Tidus gets offed at the end and Yuna lives on to be a great irony.